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Segment Information - Pre-tax income (loss) from exited business (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pre-tax income (loss) from exited business: |  |  |  |
Change in fair value of funds withheld embedded derivative |  | $ 447.4 | $ (1,085.7) | $ 3,652.8
Net realized capital gains (losses) on funds withheld assets | [1] | 87.7 | 165.0 | 749.4
Amortization of reinsurance gain (loss) |  | (631.6) | (17.7) | (19.3)
Reconciling items |  |  |  |
Pre-tax income (loss) from exited business: |  |  |  |
Change in fair value of funds withheld embedded derivative |  | 447.4 | (1,085.7) | 3,652.8
Net realized capital gains (losses) on funds withheld assets |  | 87.7 | 165.0 | 749.4
Strategic review costs and impacts on pre-tax income (loss) |  |  |  | 40.4
Amortization of reinsurance gain (loss) |  | (589.6) | (68.7) | (56.7)
Other impacts of reinsured business |  | 137.9 | (140.4) | (125.8)
Total pre-tax income (loss) from exited business |  | 83.4 | (1,129.8) | 4,260.1
Total income tax expense (benefit) related to exited business |  | $ 17.6 | $ (238.1) | $ 956.4
[1] | Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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